Question

Which element among the following is used as reducing agent for reduction of remaining three elements from their oxides?

Options

• Mg

• Zn

• Al

• Hg

Answer 1

Mg

Explanation:

${\displaystyle {\text{E}}_{\text{Mg}}^0}$ = - 2.37, ${\displaystyle {\text{E}}_{\text{Zn}}^0}$ = - 0.763

${\displaystyle {\text{E}}_{\text{Al}}^0}$ = - 1.66, ${\displaystyle {\text{E}}_{\text{Hg}}^0}$ = + 0.79

∵ ${\displaystyle {\text{E}}_{\text{Mg}}^0}$ is very small it undergo oxidation, it means it acts as a reducing agent.